Grinding and polishing machine.



N0. 682,999. Patented Sept. I7, I9DI.

R. H. REID.

GRINDING AND POLISHING MACHINE.

Sheet I.

2 Sheets- (Application flled. May 13, 1901.)

(No Model.)

. Wm N %r 3 NT- I Ma da.

V I 5:: H

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UNrrED STATES PATENT OFFICE.

ROBERT H. REID, OF NEIV YORK, N. Y., ASSIGNOR TO JOHN H. SHIPWAY,

OF SAME PLACE.

GRINDING AND POLISHING MACHINE.

SPECIFICATION forming part of Letters Iatent No. 682,999, datedSeptember 1'7, 1901.

Application filed May 13 1901.

New York, have invented certain new and useful Improvements in Grindingand Polishing Machines, of which the following is a specification.

My present invention pertains to improvements in grinding and polishingmachines for floors, the construction and advantages of which will behereinafter set forth, reference being had to the annexed drawings,wherein-- Figure 1 is a perspective View of the apparatus; Fig. 2, a topplan View of the same; Fig. 3, a detail view showing the connectionintermediate one of the shafts and the grinding and polishing members;Fig. 4, a vertical sectional view of the same; Fig. 5, a side elevationof a modified form of connection, and Fig. 6 a vertical sectional viewof the same.

In finishing mosaic and tessellated floors it has been the commonpractice to rub down and reduce the surface thereof by hand, commonlyemploying a hand-tool therefor. It has also been proposed to employmachinery for such work.

The machine shown in the accompanying drawings has been found fromactual and continued use to give highly efficient service and does awaywith the difficulties heretofore encountered in the employment ofmachines for this class of work.

To insure an even floor-surface, it is essential that the disks orgrinding members rotate in a horizontal plane, that two or more beemployed, that they work in opposition to' each other-that is to say,rotate in opposite directions-and that under ordinary circumstances thedisks be set out of line and their paths be made to overlap. Where butone disk or grinding member is employed, it is practically impossible tohold the machine in position or guide it about over the floor-surface,and in use a inachine so constructed has been found to be moredetrimental than otherwise. That the disks should Work with theirfiat-faces down is likewise necessary. Otherwise grooves would be formedin the floor. Arranging the disks out of line prevents the Serial No.60,080- (No model.)

formation of ridges, for, as will be seen, a ridge which might be formedalong the edge of one of the disks or grinding members will beobliterated by one of the other disks of the series as the machine ismoved back and forth.

In the accompanying drawings there is shown an actual embodiment of myapparatus, in which A denotes the bed of the ma- 6o chine, mounted uponsuitable wheels B, with handles 0 and D to facilitate easy manipulation.This portion of the apparatus is, in efi'ect, a truck. An electricmotorE issecurely mounted on the bed or base and is closely housed toprevent entrance of sand or any other foreign substance. Thearmatureshaft F is extended out at each side and carries bevel-pinions GG at its ends. Meshing with said pinions are corresponding bevel- 7egears H H, mounted, respectively, upon shafts or spindles I 1. Each ofsaid shafts, as also those hereinafter referred to, passes down througha long box or bearin g member J which is securely fastened to the bed,the long sprocket-chain L, said chain likewise passing about a sprocketM, carried by a shaft N. A sprocket O is secured to shaft I above gearH, and a driving-chain P passes about it and a sprocket Q, mounted on ashaft or spindle B. Each of the shafts I and R is provided at its upperend with a box or bearing-block S, and these blocks are connected by acrossbar T, which serves to securely maintain the shafts in alinement.Shaft I in a similar manner drives a shaft B through sprocketo and-chainconnection, while said shaft R is in turn connected to a shaft N throughsprocket-chain L and suitable sprocketwheels. Each of the shafts hasoperatively connected to its lower end a grinding or polishing disk ormember U. In the form illustrated in Figs. 1, 3, and 4 the grinding andpolishing member comprises a flat disk or plate having a series of holesor recesses V formed in its upper face and into which ex 10c tend thedownwardly-projecting fingers W of a spider X, which is securelyattached to the of the shaft.

lower end of the shaft. The disks or members will preferably be formedof cast-iron or zinc, though any other suitable substance may beemployed. Zinc or soft iron permits the sand or other abrading substanceto embed. itself in the working surface, and thereby renders the actionof the disks more efficient.

In Figs. 5 and 6 disk U is shown as pro- I vided with a hollow boss Y,which embraces a rounded head Z, formed on the lower end The boss isprovided with a series of vertically-disposed grooves into which projectpins a, extending out from head Z. With either form of attachment thegrinding disk or member, while partaking of the rotary motion of theshaft, may, nevertheless, tilt or rock slightly to accommodate itself toany slight unevenness existing in the surface worked upon.

With the various shafts geared together as above pointed out three ofthe disks will rotate in one direction, while the other three willrotate in the reverse direction, thereby maintaining the machine in afixed position. By driving from the shafts I I both above and below thebearing thereof the strains to which the shafts are subjected areneutralized to a greater or less extent. It will also be observed thatthe disks practically overlap the paths of one another, and theformation of ridges is thereby avoided.

It is manifest that any number of disks may be employed, though ofcourse they should be made to rotate in the proper direction in order toneutralize each other in their tendency to throw the apparatus out ofposition. It is likewise apparent that any motor other than an electricmotor may be employed, though, as will be generally understood, the

electric motor is preferable from many points of view.

Having thus described my invention, what I claim is- 1. In a grindingand polishing machine, the combination of a suitable base; a series ofvertically-disposed shafts carried thereby; abrading-disks carried bythe lower ends of said shafts; and means for imparting rotary motion tothe shafts, part in one direction and part in the reverse.

2. In a grinding and polishing machine, the combination of a wheeledtruck; a series of vertically-disposed shafts carried thereby;abrading-disks carried by the lower ends of said shafts; a motor mountedon the truck; and connections intermediate the motor for impartingmotion to said shafts and. disks,

part in one direction and part in the reverse direction.

3. In a grinding and polishing machine, the combination of a wheeledtruck; a series of vertically-disposed shafts carried thereby; anabrading-disk flexibly connected to the lower end of each shaft; a motormounted on the truck; and connections intermediate the shafts and themotor.

4. In a grinding and polishing machine, the combination of a wheeledtruck; a motor carried thereby; 'a pair of vertically-disposed shaftsgeared tosaid motor to rotate in opposite directions; a second pair ofverticallydisposed shafts carried by the truck; driving connectionsbetween each member of the first pair of shafts and a member of thesecond pair; and a grinding-disk flexibly connected to the lower end ofeach of said shafts.

5. In a grinding and polishing machine,

the combination of a wheeled truck; a motor;

a shaft extending out from each side thereof; pinions G, G carried bythe ends of said shaft; a pair .of vertically-disposed shafts; gearscarried by said shafts and meshing with the pinions; shafts R and Noperatively connected to one of said shafts; shafts R and N op erativelyconnected to the second shaft of the pair; and grinding-disks flexiblyconnected to the lower ends of the shafts.

6. In a grinding and polishing machine, the combination of awheeledjruck; an electric motor. carried thereby, and having itsarmature shaft extending out to each side thereof; pinions G, G carriedby the ends of said shaft; shafts I, I mounted on the truck; gears H, Hcarried by the shafts and meshing with the pinions; shaft N;sprocket-andchain connections intermediate said shaft and shaft I; shaftR sprocket-and-chain con nections intermediate said shaft and the shaftI; a brace extending between upper ends of the shafts I and R; a shaftN; sprocket-andchain connections intermediate said shaft and the shaft1; a shaft R; sprocket-and-chain connections between shaft R and theshaft T; a brace extending between the upper end of shaft I and R andgrinding-disks carried at the lower ends of said shafts I, I, N, N, Rand R.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

ROBERT H. REID.

Witnesses:

HENRY C. FAILING, O. C. PAULDING.

